The option, if the money is available, to rebuild Highbury and Islington with a new bigger station on the current pedestrian plaza/former Post Office site remains. It has certainly been explored and would include lifts to permit disabled access.The demolition of the original Highbury and Islington after WW2. Not sure if that was BR or London Transport. Now we're stuck with a miserable cramped station.
I note that you carefully ignore the serious damage done to the original building by a V-1 in 1944. I imagine that restoring the original building, which was massive overkill for the requirement, was deemed not a priority in economically stained times. That building would have been a serious ongoing maintenance drain too.
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